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— Our classroom        every day.
— So it is. It is our duty to keep it clean and tidy.
A.cleansB.is cleaning
C.is cleanedD.was cleaned
答案:C
试题分析:根据题意可知用一般现在时的被动语态be done的结构根据句意;---我们的教室每天被打扫;---的确是,保持我们的教室干净和整洁这是我们的职责。结合语境故选C
考点:考查被动语态。